Improvement in cutters for tonguing and grooving



UNITED STATES PATENT OEEIGE,

DEWI'IT O. DEVALL, OF NEW YORK, ASSIGNOR TO JOHN B. SOHENOK, OF MATTEAWAN, NEW YORK.

IMPROVEMENT IN CUTTERS FOR TONGUING AND GROOVING.

Specification forming part of Letters Patent N0. 88,143, dated March 23, 186i).

Tov all whom 'it may concern:

Be it known that I, DEWITT C. DEVALL, of New York, in the county and State of New York, have invented a new and useful Improvement in Cutters for Tonguing and Grooving; and I do hereby declare that the following is a full,

. clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specification.

This invention relates to an improvement in cutters for ton guing and groovin g, and of that class which are perfectly straight, and are secured -in the cutter-head by set-screws bearin g directly upon them.

The groovingfcutter is formed by making two parallel longitudinal grooves extending its whole length. The cutters for producing` the tongues are also formed of one piece of metal, grooved near their center, of the same width of the tongue. Each of the cutters is formed of one piece of metal.

The invention consists in the manner of making the tongues and grooves of greater or less depth, as occasion may require, by the different bevels given to the cutters.

In the accompanying sheet of drawings, Figure l is a section of a cutter-head provided with improved cutters. .fr x, Fig. 3, is the line of section; Fig. 2, a side view of the cutterhead, partly in section; Fig. 3, an endvview of the cutter-head: Fig. 4, a detached side view of a grooving-cutter.

Similar letters of reference indicate corresponding parts.

A represents a cutter-head, composed of a central tube, a, having three wings, b, extending from it at equal distances apart, in which the cutters B O are fitted, suitable recesses or openings being in the wings to receive the cutters. These cutters are made perfectly straight, and each out of a single piece of metal.

The groovingcutter B is formed by taking a piece of steel of the proper dimensions and making two longitudinal grooves, c c, in it, extending its whole length. These grooves leave a central or nearly central longitudinal rib, d, and a lip, c, at each side of the cutter. One end of d is beveled, to form the cutter which cuts the groove, and the lips e e serve to give a proper bearing to the cutter in the wing b, in which it is iitted, causing one side of the cutter to bear firmly against one side of the recess or opening in the wing and the other side of the cutter to leave abroad surface for the inner ends of the set-screws D to press against, as shown clearly in Fig. l. By this arrangement the cutters cannot casually move in the wings of the cutter-head, as they may be held 4firmly iu position. y

The ordinary straight cutters, which are composed each of different parts, the central part, d, being separate from the side portions, are very liable to move or shift their position.

The cutters O, for cut-tin g the tongues, are simply formed of a straight piece of steel grooved near their center longitudinally; and as the full Width of these cutters is obtained at both sides or edges, there is no difliculty whatever as regards the holding of them in proper position.

In order to vary the cutting-edges, so as to produce a deeper groove or wider tongue, it is only necessary to change the bevel of the cutter-that is to say, the bevel of the cutters is increased or diminished in length, as the case may require.

I claim as new and desire to secure by Let- `ner specified.

DEWITT G. DEVALL. IVitnesses:

WM. F. MCNAMARA, ALEX. F. ROBERTS. 

